The Government has confirmed it will conduct an investigation into Telstra's triple-0 outage which saw emergency calls from around the country go unanswered.

Telstra is under pressure to explain how damage to one cable in regional New South Wales caused the outage in a number of states, and a spokesman for the Minister for Communications Mitch Fifield confirmed it had begun asking questions.

"The Department of Communications is conducting the investigation into the network outage which impacted the delivery of calls to triple zero on the 4th of May," the spokesman said in a statement.

"The Department will seek information from Telstra and assistance from the [Australian Communications and Media Authority] in the conduct of the investigation."

The damaged cable, one of the network's three major links nationally, was cut in the early hours of the morning.

It caused intermittent interruptions to triple-0 services in New South Wales, Victoria, Queensland, South Australia, Western Australia and Tasmania.

Hundreds of traffic lights in Victoria were also affected, and there were reports of disruptions to other telephone services and EFTPOS machines.

The telco later tweeted a photo of the cable pit, between Bowral and Orange, which it said had "significant fire damage consistent with lightning strike".

Queensland

Queensland Ambulance said it had reviewed its call logs and identified 11 patients who had been delayed reaching the call centre.

"Of the affected patients we've contacted, we're satisfied there has not been any adverse impact to their care. We will continue to rigorously monitor the service throughout the day," the QAS said in a statement.

Queensland Police said there had been some issues on the Sunshine Coast but the problem did not appear to be widespread.

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